清除Picasso的缓存

Question

I'm trying to clear the cache memory of Picasso via Android coding.

Can anyone please help me in this issue..?

I have tried using the following code, but this was not useful in my case:

Picasso.with(getActivity()).load(data.get(pos).getFeed_thumb_image()).skipMemoryCache().into(image);

Answer 1

请改用：

 Picasso.with(getContext()).load(data.get(pos).getFeed_thumb_image()).memoryPolicy(MemoryPolicy.NO_CACHE).into(image);

Answer 2

Remove cache of Picasso like this.

public class Clear {

    public static void clearCache (Picasso p) {
        p.cache.clear();
    }
}

This util class can clear the cache for you. You just have to call it:

Clear.clearCache(Picasso.with(context));

EDIT :
The class Clear must be in the package :

package com.squareup.picasso;

Because cache is not accessible from outside that package. Like in this answer: https://stackoverflow.com/a/23544650/4585226

Answer 3

if you are trying to load an image through Json(from db) try clearing the networkCache for a better result.

Picasso.with(context).load(uri).networkPolicy(NetworkPolicy.NO_CACHE)
        .memoryPolicy(MemoryPolicy.NO_CACHE)
        .placeholder(R.drawable.bv_logo_default).stableKey(id)
        .into(viewImage_imageView);

Answer 4

When activity destroy, unfortunately bitmap was not recycled if we're using Picasso. I try to programmatically recycle bitmap, what's loaded in to image view. There is a way to reference to loaded bitmap by using Target .

 Target mBackgroundTarget = new Target() {
        Bitmap mBitmap;

        @Override
        public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
            if (bitmap == null || bitmap.isRecycled())
                return;

            mBitmap = bitmap;
            mBgImage.setImageBitmap(bitmap);
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    // Do some animation
                }
            });
        }

        @Override
        public void onBitmapFailed(Drawable errorDrawable) {
            recycle();
        }

        @Override
        public void onPrepareLoad(Drawable placeHolderDrawable) {

        }

        /**
         * Recycle bitmap to free memory
         */
        private void recycle() {
            if (mBitmap != null && !mBitmap.isRecycled()) {
                mBitmap.recycle();
                mBitmap = null;
                System.gc();
            }
        }
    };

And when Activity destroy, I call onBitmapFailed(null) to recycle loaded bitmap.

@Override
protected void onDestroy() {
    super.onDestroy();
    try {
        if (mBackgroundTarget != null) {
            mBackgroundTarget.onBitmapFailed(null);
            Picasso.with(context).cancelRequest(mBackgroundTarget);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

But remember, DON'T CACHE IMAGE IN MEMORY by this case, It will cause Use recycled bitmap exception.

Picasso.with(context)
            .load(imageUrl)
            .resize(width, height)
            .memoryPolicy(MemoryPolicy.NO_CACHE)
            .into(mBackgroundTarget);

Hope this help.

Answer 5

Instead of clearing the complete cache if one wants to refresh the image with the given Uri. try this Picasso.with(context).invalidate(uri); it internally removes the key from the cache maintained by Picasso.

Excerpt from Picasso.java /** * Invalidate all memory cached images for the specified {@code uri}. * * @see #invalidate(String) * @see #invalidate(File) */ public void invalidate(Uri uri) { if (uri == null) { throw new IllegalArgumentException("uri == null"); } cache.clearKeyUri(uri.toString()); } /** * Invalidate all memory cached images for the specified {@code uri}. * * @see #invalidate(String) * @see #invalidate(File) */ public void invalidate(Uri uri) { if (uri == null) { throw new IllegalArgumentException("uri == null"); } cache.clearKeyUri(uri.toString()); }

Answer 6

If you keep reference of your custom Downloader implementation you can clear cache.

public class PicassoUtil {
    private static Picasso sInstance;
    private static OkHttp22Downloader sDownloader;
    public  static Picasso getPicasso(Context context){
        if(sInstance == null) {
            sDownloader = new OkHttp22Downloader(context)
            Picasso.Builder builder = new Picasso.Builder(context);
            builder.downloader(sDownloader);
            sInstance = builder.build(sDownloader);
        }
        return sInstance;
    }
   public static void clearCache(){
      if(sDownloader != null){
        sDownloader.clearCache();
      }
   }
}

It is important to have access to your http client and its Cache . In my implementation there is access to the cache, hence clearing cache with clearCache() method.

Answer 7

i had the same problem. It worked for me. I used Picasso in RecycleView inside a dialog . When i closed dialog, picasso doesnt clear cache. But while you are using the dialog it clears image cache . However there is some cache that is not cleared. Maybe the cache that was not cleared is the last you seen in dialog before dialog.dismiss().

use this memoryPolicy(MemoryPolicy.NO_CACHE,MemoryPolicy.NO_STORE)

Picasso.with(activity).load(file).resize(100,100).centerCrop().memoryPolicy(MemoryPolicy.NO_CACHE,MemoryPolicy.NO_STORE).into(contactImage, new com.squareup.picasso.Callback() {
               @Override
                public void onSuccess() {

                }

                @Override
                public void onError() {

                }
            });

Answer 8

 Picasso.with(this.getContext()).load(gamePlayer.getPlayerProfileUrl()).skipMemoryCache().into(iv);

这也有效